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Re: issue 168 proposal: xsi:type of external references in Encoding

From: Jacek Kopecky <jacek@systinet.com>
Date: Mon, 10 Dec 2001 21:05:34 +0100 (CET)
To: Noah Mendelsohn <noah_mendelsohn@us.ibm.com>
cc: xml-dist-app <xml-dist-app@w3.org>
Message-ID: <Pine.LNX.4.33.0112102104200.9926-100000@mail.idoox.com>
 Noah, please see my proposal to #170 [1] and the following
thread, I think it handles exactly the problem you describe in
your message.
 Best regards,

                   Jacek Kopecky

                   Senior Architect, Systinet (formerly Idoox)
                   http://www.systinet.com/

[1] http://lists.w3.org/Archives/Public/xml-dist-app/2001Dec/0012.html



On Mon, 10 Dec 2001, Noah Mendelsohn wrote:

 >
 > As I've suggested before, I think there are issues relating to external
 > references that go beyond the encodings, and I think our approach has to be
 > consistent across the cases.  If I send you a document that uses encoding
 > and has an href to some other URL, what are my obligations in following
 > that link?  It has very bad performance and security implications if you
 > even imply that a conforming implementation MUST try to open a random URL
 > that happens to show up in the href of a document.
 >
 > This also relates to our handling of SOAP+Attachments and DIME, which I
 > think we've delayed for now.
 >
 > So, we need to indicate in the encodings, what is the result if there is an
 > href you choose not to follow or can't follow?  Is it that a fault should
 > be generated?  Is it the same fault as if an href in the form of a fragment
 > referencing the envelope itself fails?  Thanks.
 >
 > ------------------------------------------------------------------------
 > Noah Mendelsohn                                    Voice: 1-617-693-4036
 > Lotus Development Corp.                            Fax: 1-617-693-8676
 > One Rogers Street
 > Cambridge, MA 02142
 > ------------------------------------------------------------------------
 >
 >
 >
 >
 >
 >
 >                       Jacek Kopecky
 >                       <jacek@systinet.         To:      <xml-dist-app@w3.org>
 >                       com>                     cc:
 >                       Sent by:                 Subject: issue 168 proposal: xsi:type of external references in Encoding
 >                       xml-dist-app-req
 >                       uest@w3.org
 >
 >
 >                       12/09/01 02:05
 >                       PM
 >
 >
 >
 >
 >
 >
 >  Hi all. 8-)
 >  This is a proposal for resolving issue 168 [1].
 >  The issue wants to know the XML Schema Instance type of the data
 > that is referenced by the href attribute and that is external to
 > the referencing document.
 >
 >  The proposal:
 >  The type of referenced data depends on whether the referenced
 > document is an XML document or not. The possible means of
 > determining whether a particular document is XML or not include
 > using MIME types, file extensions or file introspection.
 >  In case the document is XML, the referenced data is either the
 > root element or the element identified by its ID (in case the
 > referencing URL contains the #<id> part), the type of this data
 > is determined the same way as if the reference was internal.
 >  In case the document is not XML, the type of the referenced data
 > is enc:binary, a simple type with the value space of the set of
 > finite-length sequences of binary octets and the same lexical
 > space. [guess I'll need somebody's help with this definition]
 >
 >  A different proposal could try to introduce some means of
 > otherwise typing the data (for example an attribute
 > enc:hrefType). To me this seems too complicated.
 >  Yet another proposal could disallow external references
 > altogether. This would IMO meet big push back from the proponents
 > of the current practice of attaching data.
 >
 >  Anyway, here it is, read for being discussed. 8-)
 >
 >                    Jacek Kopecky
 >
 >                    Senior Architect, Systinet (formerly Idoox)
 >                    http://www.systinet.com/
 >
 >
 > [1] http://www.w3.org/2000/xp/Group/xmlp-issues.html#x168
 >
 >
 >
 >
Received on Monday, 10 December 2001 15:05:36 UTC

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